How to write the sum formula of cosine as a single function and angle

The video tutorial explains how to identify and apply trigonometric function formulas, focusing on the cosine sum and difference formula. It covers the process of determining which formula to use, the relationship between angles in the formula, and provides examples to clarify the application. The tutorial concludes with a summary and addresses common confusions.

What is the relationship between the angles when using the cosine sum and difference formulas?

How do the cosine and sine formulas differ when it comes to addition and subtraction?

Explain how the cosine formula changes when subtracting two angles.

What happens to the sine function when adding two angles according to the formulas discussed?

Describe the significance of the angles U and V in the context of the cosine formula.